Automation System
A disadvantage of Numerical Control (NC) is:

the machine tool can easily overheat
None of these
the tape and tape reader are not reliable
the computer is not reliable
one operator is needed for each machine.

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Automation System
An operating system:

All of these
is useless in most control applications
can help reduce software development time
None of these
provides ability for other programmers to understand the software structure

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Automation System
A dc servo motor:

None of these
All of these
uses a variable dc voltage for speed control
uses a tachometer for speed feedback
can provide precise position control

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